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      Java
    </span></i></div></div> <div class="theme-reco-content content__default" style="display:none;"><div id="boxx" data-v-f4ca0dac><div data-v-f4ca0dac><p v-if="true" class="custom-block-title" data-v-f4ca0dac></p> <p v-if="true" data-v-f4ca0dac></p></div></div> <p></p><div class="table-of-contents"><ul><li><a href="#多线程">多线程</a></li><li><a href="#多线程创建方式">多线程创建方式</a><ul><li><a href="#继承-thread-类">继承 Thread 类</a></li><li><a href="#实现-runable-接口">实现 Runable 接口</a></li><li><a href="#实现-callable-接口">实现 Callable 接口</a></li></ul></li><li><a href="#自己造一个并发实例">自己造一个并发实例</a></li><li><a href="#实现线程同步的几种方式">实现线程同步的几种方式</a></li><li><a href="#利用java工具查看死锁">利用java工具查看死锁</a></li><li><a href="#创建线程池的几种方式">创建线程池的几种方式</a></li><li><a href="#线程池的基本使用">线程池的基本使用</a></li></ul></div><p></p> <h2 id="多线程"><a href="#多线程" class="header-anchor">#</a> 多线程</h2> <ul><li><p>这篇介绍了什么是多线程及多线程的实现方式和常用方法，写的很详细，特在此记录一下</p> <p><a href="https://blog.csdn.net/vbirdbest/article/details/81282163" target="_blank" rel="noopener noreferrer">https://blog.csdn.net/vbirdbest/article/details/81282163<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></p></li></ul> <h2 id="多线程创建方式"><a href="#多线程创建方式" class="header-anchor">#</a> 多线程创建方式</h2> <ul><li>如看过上文地址，可跳过此节直接看下一节<code>自己造一个并发实例</code>，后面才是干货！</li></ul> <h3 id="继承-thread-类"><a href="#继承-thread-类" class="header-anchor">#</a> 继承 Thread 类</h3> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Main</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">new</span> <span class="token class-name">MyThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">MyThread</span> <span class="token keyword">extends</span> <span class="token class-name">Thread</span> <span class="token punctuation">{</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;\t&quot;</span> <span class="token operator">+</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><h3 id="实现-runable-接口"><a href="#实现-runable-接口" class="header-anchor">#</a> 实现 Runable 接口</h3> <ul><li>第一种方式是继承Thread类，因Java是单继承，如果一个类继承了Thread类，那么就没办法继承其它的类了，在继承上有一点受制，有一点不灵活，第二种方式就是为了解决第一种方式的单继承不灵活的问题，所以平常使用就使用第二种方式</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Main</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
         <span class="token comment">// 将Runnable实现类作为Thread的构造参数传递到Thread类中，然后启动Thread类</span>
        <span class="token class-name">MyRunnable</span> runnable <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MyRunnable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span>runnable<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">MyRunnable</span> <span class="token keyword">implements</span> <span class="token class-name">Runnable</span> <span class="token punctuation">{</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;\t&quot;</span> <span class="token operator">+</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><h3 id="实现-callable-接口"><a href="#实现-callable-接口" class="header-anchor">#</a> 实现 Callable 接口</h3> <ul><li>重写call()方法，然后包装成java.util.concurrent.FutureTask, 再然后包装成Thread</li> <li>Callable：有返回值并且能捕获异常，能取消线程，可以判断线程是否执行完毕</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Main</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
         <span class="token comment">// 将Callable包装成FutureTask，FutureTask也是一种Runnable</span>
        <span class="token class-name">MyCallable</span> callable <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MyCallable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">FutureTask</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Integer</span><span class="token punctuation">&gt;</span></span> futureTask <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FutureTask</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>callable<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span>futureTask<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token comment">// get方法会阻塞调用的线程</span>
        <span class="token class-name">Integer</span> sum <span class="token operator">=</span> futureTask<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;=&quot;</span> <span class="token operator">+</span> sum<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">MyCallable</span> <span class="token keyword">implements</span> <span class="token class-name">Callable</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Integer</span><span class="token punctuation">&gt;</span></span> <span class="token punctuation">{</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token class-name">Integer</span> <span class="token function">call</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">{</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;\t&quot;</span> <span class="token operator">+</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;\t&quot;</span> <span class="token operator">+</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot; \tstarting...&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">int</span> sum <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> <span class="token number">100000</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            sum <span class="token operator">+=</span> i<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;\t&quot;</span> <span class="token operator">+</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;\t&quot;</span> <span class="token operator">+</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot; \tover...&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> sum<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br></div></div><h2 id="自己造一个并发实例"><a href="#自己造一个并发实例" class="header-anchor">#</a> 自己造一个并发实例</h2> <ul><li><p>有人可能对多线程及并发还不是很了解，那么就简单上手一个并发实例来体验一下吧！</p></li> <li><p>注意：下边的例子，自己多运行几次，看一下不同的结果</p> <blockquote><ol><li>当对现场加锁的时候就不会并发：
<ul><li>打印结果：张曼玉：女士 / 梁朝伟：先生</li></ul></li> <li>而如果对线程不加锁的话，就可能会造成并发：
<ul><li>打印结果：张曼玉：先生 / 梁朝伟：女士</li> <li>打印结果：张曼玉：女士 / 梁朝伟：先生</li></ul></li></ol></blockquote></li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">/**
 * @className: TestThreadPool
 * @descripe: 自己造一个并发的例子
 * @author: zpj
 * @date: 2019/7/8
 * @version: 1.0
 */</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TestConcurrentError</span><span class="token punctuation">{</span>
	<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span><span class="token punctuation">{</span>
		<span class="token class-name">Student</span> stu <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token string">&quot;张曼玉&quot;</span><span class="token punctuation">,</span><span class="token string">&quot;女士&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token class-name">PrintThread</span> pt <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PrintThread</span><span class="token punctuation">(</span>stu<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token class-name">ChangeThread</span> ct <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ChangeThread</span><span class="token punctuation">(</span>stu<span class="token punctuation">)</span><span class="token punctuation">;</span>
		pt<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		ct<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">Student</span><span class="token punctuation">{</span>
	<span class="token class-name">String</span> name<span class="token punctuation">;</span>
	<span class="token class-name">String</span> gender<span class="token punctuation">;</span>
	<span class="token keyword">public</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">,</span><span class="token class-name">String</span> gender<span class="token punctuation">)</span><span class="token punctuation">{</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>gender <span class="token operator">=</span> gender<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">PrintThread</span> <span class="token keyword">extends</span> <span class="token class-name">Thread</span><span class="token punctuation">{</span>
	<span class="token class-name">Student</span> stu<span class="token punctuation">;</span>
	<span class="token keyword">public</span> <span class="token class-name">PrintThread</span><span class="token punctuation">(</span><span class="token class-name">Student</span> stu<span class="token punctuation">)</span><span class="token punctuation">{</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>stu <span class="token operator">=</span> stu<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token annotation punctuation">@Override</span>
	<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
		<span class="token keyword">while</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
			<span class="token comment">//synchronized(stu){</span>
			<span class="token punctuation">{</span>
				<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>stu<span class="token punctuation">.</span>name <span class="token operator">+</span> <span class="token string">&quot; : &quot;</span> <span class="token operator">+</span> stu<span class="token punctuation">.</span>gender<span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">class</span> <span class="token class-name">ChangeThread</span> <span class="token keyword">extends</span> <span class="token class-name">Thread</span><span class="token punctuation">{</span>
	<span class="token class-name">Student</span> stu<span class="token punctuation">;</span>
	<span class="token keyword">public</span> <span class="token class-name">ChangeThread</span><span class="token punctuation">(</span><span class="token class-name">Student</span> stu<span class="token punctuation">)</span><span class="token punctuation">{</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>stu <span class="token operator">=</span> stu<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token annotation punctuation">@Override</span>
	<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
		<span class="token keyword">boolean</span> isOkay <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
		<span class="token keyword">while</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
			<span class="token comment">//synchronized(stu){</span>
			<span class="token punctuation">{</span>
				<span class="token keyword">if</span><span class="token punctuation">(</span>isOkay<span class="token punctuation">)</span><span class="token punctuation">{</span>
					stu<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">&quot;梁朝伟&quot;</span><span class="token punctuation">;</span><span class="token comment">//梁朝伟 女士</span>
					stu<span class="token punctuation">.</span>gender <span class="token operator">=</span> <span class="token string">&quot;先生&quot;</span><span class="token punctuation">;</span><span class="token comment">//梁朝伟 先生</span>
				<span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
					stu<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">&quot;张曼玉&quot;</span><span class="token punctuation">;</span><span class="token comment">//张曼玉 先生</span>
					stu<span class="token punctuation">.</span>gender <span class="token operator">=</span> <span class="token string">&quot;女士&quot;</span><span class="token punctuation">;</span><span class="token comment">//张曼玉 女士</span>
				<span class="token punctuation">}</span>
				isOkay <span class="token operator">=</span> <span class="token operator">!</span>isOkay<span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br></div></div><h2 id="实现线程同步的几种方式"><a href="#实现线程同步的几种方式" class="header-anchor">#</a> 实现线程同步的几种方式</h2> <p>​	通过上面的实例我们知道了并发是怎么产生的，那我们如何解决呢？那就是使线程同步或给线程加锁呗！</p> <ul><li>实现线程同步的几种方式：</li></ul> <ol><li><p>使用synchronized关键字</p> <p>synchronized既可以修饰方法也可以修饰代码块，用synchronized 关键字时一定要注意用于保护共享数据，防止造成资源浪费（synchronized 本来效率就不高）</p></li> <li><p>wait()和notify() =&gt; 相当于引入等待池</p> <p>wait()：Object类的方法，使一个线程处于等待状态，并且释放所持有的对象的lock。</p> <p>sleep(1000)：Thread类的方法，使一个正在运行的线程处于睡眠状态，是一个静态方法，调用此方法要捕捉InterruptedException异常。
notify()：唤醒一个处于等待状态的线程，注意的是在调用此方法的时候，并不能确切的唤醒某一个等待状态的线程，而是由JVM确定唤醒哪个线程，而且不是按优先级。
Allnotity()：唤醒所有处入等待状态的线程，注意并不是给所有唤醒线程一个对象的锁，而是让它们竞争。</p> <p>**注意：**wait、notify和notifyAll方法只能在同步方法或者同步代码块中使用，而sleep方法可以在任何地方使用。</p></li> <li><p>使用java.util.concurrent.ReentrantLock重入锁实现线程同步</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code>	<span class="token keyword">private</span> <span class="token keyword">int</span> account <span class="token operator">=</span> <span class="token number">100</span><span class="token punctuation">;</span>
	<span class="token comment">//获得锁对象</span>
	<span class="token keyword">private</span> <span class="token class-name">ReentrantLock</span> lock <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ReentrantLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">getAccount</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">return</span> account<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token comment">//同步方法</span>
	<span class="token keyword">public</span>  <span class="token keyword">void</span> <span class="token function">save</span><span class="token punctuation">(</span><span class="token keyword">int</span> money<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		lock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//加锁</span>
		<span class="token keyword">try</span> <span class="token punctuation">{</span>
			account<span class="token operator">+=</span>money<span class="token punctuation">;</span>
		<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
			lock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//解锁</span>
		<span class="token punctuation">}</span>
		
	<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div></li></ol> <h2 id="利用java工具查看死锁"><a href="#利用java工具查看死锁" class="header-anchor">#</a> 利用java工具查看死锁</h2> <ol><li><p>图形界面：jconsole.exe</p></li> <li><p>命令行：jps 和 jstack</p></li></ol> <h2 id="创建线程池的几种方式"><a href="#创建线程池的几种方式" class="header-anchor">#</a> 创建线程池的几种方式</h2> <ul><li>既然都了解到线程并发了，那怎么能不了解了解线程池呢！😄</li> <li>java.util.concurrent.Executors类，这个类是用来创建线程池的：</li></ul> <ol><li><p>newFixedThreadPool()</p> <p>创建固定大小的线程池 线程池的大小一旦达到最大值就会保持不变，如果某个线程因为执行异常而结束，那么线程池会补充一个新线程</p></li> <li><p>newCachedThreadPool()</p> <p>创建一个可缓存的线程池，如果线程池的大小超过了处理任务所需要的线程，那么就会回收部分空闲(60s不执行任务)的线程，当任务数量增加时，此线程池又可以智能的添加新线程来处理任务。此线程池不会对线程池大小做限制，线程池大小完全依赖于系统（JVM）能够创建的最大线程大小</p></li> <li><p>newSingleThreadExecutor()</p> <p>创建一个单线程的线程池。这个线程池只有线程在工作，也就是相当于单线程串行执行所有任务。如果这个唯一的线程因为异常结束，那么会有一个新的线程来替代它。此线程池保证所有任务的执行顺序按照任务的提交顺序执行</p></li> <li><p>newScheduledThreadPool()</p> <p>创建一个大小无限的线程池，此线程池支持定时以及周期性执行任务的需求</p></li> <li><p>newSingleThreadScheduledExecutor()</p> <p>创建一个单线程的线程池。此线程池支持定时以及周期性执行任务的需求</p></li></ol> <h2 id="线程池的基本使用"><a href="#线程池的基本使用" class="header-anchor">#</a> 线程池的基本使用</h2> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>text<span class="token punctuation">.</span></span><span class="token class-name">SimpleDateFormat</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token operator">*</span><span class="token punctuation">;</span>

<span class="token comment">/**
 * @className: TestThreadPool
 * @descripe: 多线程的基本使用
 * @author: zpj
 * @date: 2019/7/8
 * @version: 1.0
 */</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TestThreadPool</span> <span class="token punctuation">{</span>

    <span class="token comment">/*  打印结果：多个线程同时开始
        Thread:pool-1-thread-2 开始执行时间：2019-07-08 22:14:31
            ==  I'm a cat!  ==     &lt;1&gt;
        Thread:pool-1-thread-1 开始执行时间：2019-07-08 22:14:31
            ==  I'm a cat!  ==     &lt;0&gt;
        Thread:pool-1-thread-4 开始执行时间：2019-07-08 22:14:31
        Thread:pool-1-thread-3 开始执行时间：2019-07-08 22:14:31
            ==  I'm a cat!  ==     &lt;2&gt;
        Thread:pool-1-thread-5 开始执行时间：2019-07-08 22:14:31
            ==  I'm a cat!  ==     &lt;4&gt;
        Thread:pool-1-thread-4 开始执行时间：2019-07-08 22:14:31
            ==  I'm a cat!  ==     &lt;5&gt;
        Thread:pool-1-thread-4 开始执行时间：2019-07-08 22:14:32
            ==  I'm a cat!  ==     &lt;6&gt;
        Thread:pool-1-thread-5 开始执行时间：2019-07-08 22:14:32
            ==  I'm a cat!  ==     &lt;7&gt;
        Thread:pool-1-thread-3 开始执行时间：2019-07-08 22:14:32
        Thread:pool-1-thread-1 开始执行时间：2019-07-08 22:14:32
        Thread:pool-1-thread-3 开始执行时间：2019-07-08 22:14:32
            ==  I'm a cat!  ==     &lt;9&gt;
            ==  I'm a cat!  ==     &lt;10&gt;

     */</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>

        <span class="token comment">//要循环的次数</span>
        <span class="token keyword">int</span> x <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>

        <span class="token comment">//ExecutorService executorService = Executors.newFixedThreadPool(1);//单线程</span>
        <span class="token class-name">ExecutorService</span> executorService <span class="token operator">=</span> <span class="token class-name">Executors</span><span class="token punctuation">.</span><span class="token function">newFixedThreadPool</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//多线程</span>

        <span class="token comment">//线程计数器</span>
        <span class="token class-name">CountDownLatch</span> downLatch <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CountDownLatch</span><span class="token punctuation">(</span>x<span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;多线程执行开始！&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>i <span class="token operator">&lt;=</span> x<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token class-name">Future</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">&gt;</span></span> future <span class="token operator">=</span> executorService<span class="token punctuation">.</span><span class="token function">submit</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Cat</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span> downLatch<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">/*
            //加上它就变同步了，不知道为啥（百度咯，因为这是个阻塞的方法，future.isDone();是个非阻塞方法）
            try {
                if(future.get()==null){
                    System.out.println(&quot;第   &quot;+i+&quot;   个任务执行成功!\n&quot;);
                }
            } catch (ExecutionException e) {
                System.out.println(&quot;第   &quot;+i+&quot;   个任务执行失败!    &quot; + e.getMessage() + &quot;\n&quot;);
            }*/</span>
        <span class="token punctuation">}</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;这就证明：多线程是异步执行的！&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        downLatch<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        executorService<span class="token punctuation">.</span><span class="token function">shutdown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

   <span class="token comment">/* public static void main(String[] args) throws InterruptedException {

        //要循环的次数
        int x = 10;

        //ExecutorService executorService = Executors.newFixedThreadPool(1);//单线程
        ExecutorService executorService = Executors.newFixedThreadPool(5);//多线程

        //线程计数器
        CountDownLatch downLatch = new CountDownLatch(x);

        for (int i = 0;i &lt;= x;i++) {
            executorService.execute(new Cat(i, downLatch));
        }
        */</span><span class="token operator">/</span><span class="token operator">*</span>
         <span class="token operator">*</span>  打印结果：可以看到多个线程基本同时开始执行
            <span class="token class-name">Exception</span> in thread <span class="token string">&quot;pool-1-thread-4&quot;</span> <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>lang<span class="token punctuation">.</span></span>ArithmeticException</span><span class="token operator">:</span> <span class="token operator">/</span> by zero
                at <span class="token class-name">Cat</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">TestThreadPool</span><span class="token punctuation">.</span>java<span class="token operator">:</span><span class="token number">141</span><span class="token punctuation">)</span>
                at <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span>ThreadPoolExecutor</span><span class="token punctuation">.</span><span class="token function">runWorker</span><span class="token punctuation">(</span><span class="token class-name">ThreadPoolExecutor</span><span class="token punctuation">.</span>java<span class="token operator">:</span><span class="token number">1142</span><span class="token punctuation">)</span>
                at <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span>ThreadPoolExecutor</span>$<span class="token class-name">Worker</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">ThreadPoolExecutor</span><span class="token punctuation">.</span>java<span class="token operator">:</span><span class="token number">617</span><span class="token punctuation">)</span>
                at <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>lang<span class="token punctuation">.</span></span>Thread</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span>java<span class="token operator">:</span><span class="token number">745</span><span class="token punctuation">)</span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">1</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">39</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>0<span class="token punctuation">&gt;</span></span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">2</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">39</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>1<span class="token punctuation">&gt;</span></span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">3</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">39</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>2<span class="token punctuation">&gt;</span></span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">4</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">39</span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">5</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">39</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>4<span class="token punctuation">&gt;</span></span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">6</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">39</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>5<span class="token punctuation">&gt;</span></span>
            <span class="token class-name">Exception</span> in thread <span class="token string">&quot;pool-1-thread-3&quot;</span> <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>lang<span class="token punctuation">.</span></span>ArithmeticException</span><span class="token operator">:</span> <span class="token operator">/</span> by zero
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">1</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">40</span>
                at <span class="token class-name">Cat</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">TestThreadPool</span><span class="token punctuation">.</span>java<span class="token operator">:</span><span class="token number">141</span><span class="token punctuation">)</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>6<span class="token punctuation">&gt;</span></span>
                at <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span>ThreadPoolExecutor</span><span class="token punctuation">.</span><span class="token function">runWorker</span><span class="token punctuation">(</span><span class="token class-name">ThreadPoolExecutor</span><span class="token punctuation">.</span>java<span class="token operator">:</span><span class="token number">1142</span><span class="token punctuation">)</span>
                at <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span>ThreadPoolExecutor</span>$<span class="token class-name">Worker</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">ThreadPoolExecutor</span><span class="token punctuation">.</span>java<span class="token operator">:</span><span class="token number">617</span><span class="token punctuation">)</span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">2</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">40</span>
                at <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>lang<span class="token punctuation">.</span></span>Thread</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span>java<span class="token operator">:</span><span class="token number">745</span><span class="token punctuation">)</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>7<span class="token punctuation">&gt;</span></span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">3</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">40</span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">6</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">40</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>10<span class="token punctuation">&gt;</span></span>
            <span class="token class-name">Thread</span><span class="token operator">:</span>pool<span class="token operator">-</span><span class="token number">1</span><span class="token operator">-</span>thread<span class="token operator">-</span><span class="token number">5</span> 开始执行时间：<span class="token number">2019</span><span class="token operator">-</span><span class="token number">07</span><span class="token operator">-</span><span class="token number">08</span> <span class="token number">22</span><span class="token operator">:</span><span class="token number">00</span><span class="token operator">:</span><span class="token number">40</span>
                <span class="token operator">==</span>  <span class="token class-name">I</span>'m a cat<span class="token operator">!</span>  <span class="token operator">==</span>     <span class="token generics"><span class="token punctuation">&lt;</span>9<span class="token punctuation">&gt;</span></span>
            <span class="token operator">*</span><span class="token comment">//*</span>
        downLatch<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        executorService<span class="token punctuation">.</span><span class="token function">shutdown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token operator">*</span><span class="token operator">/</span>

<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">Cat</span> <span class="token keyword">implements</span> <span class="token class-name">Runnable</span> <span class="token punctuation">{</span>

    <span class="token keyword">int</span> i<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">CountDownLatch</span> downLatch<span class="token punctuation">;</span>

    <span class="token keyword">public</span> <span class="token class-name">Cat</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token punctuation">,</span><span class="token class-name">CountDownLatch</span> downLatch<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>i <span class="token operator">=</span> i<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>downLatch <span class="token operator">=</span> downLatch<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token class-name">SimpleDateFormat</span> format <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SimpleDateFormat</span><span class="token punctuation">(</span><span class="token string">&quot;yyyy-MM-dd HH:mm:ss&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;Thread:&quot;</span><span class="token operator">+</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">+</span><span class="token string">&quot; 开始执行时间：&quot;</span><span class="token operator">+</span>format<span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">if</span><span class="token punctuation">(</span>i <span class="token operator">==</span> <span class="token number">8</span> <span class="token operator">||</span> i <span class="token operator">==</span> <span class="token number">3</span><span class="token punctuation">)</span>
            i <span class="token operator">=</span> i<span class="token operator">/</span><span class="token number">0</span><span class="token punctuation">;</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;    ==  I'm a cat!  ==     &lt;&quot;</span> <span class="token operator">+</span> i <span class="token operator">+</span> <span class="token string">&quot;&gt;&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//每执行完一个线程 计数器就减1</span>
        downLatch<span class="token punctuation">.</span><span class="token function">countDown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span 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